Vehicle front window electric heating device and method for deicing by means of electric heating device

Abstract

The invention relates to a vehicle front window electric heating device and a method for deicing by means of the electric heating device. Electric heating wires of front window glass are separated to form a plurality of heating areas with the same resistance value, and the electric heating wire of each heating area is led out through a bus and is connected with an external power supply. The electric heating device is further provided with a temperature controller and an extremely-cold mode starting switch, the temperature controller is used for sensing the temperature of the front window glass, the temperature controller and the extremely-cold mode starting switch are connected with the buses of the heating areas through a series-parallel connection conversion control circuit, and accordingly series-parallel connection state conversion of the electric heating wires of the heating areas is achieved. Double-power heating is carried out on the front window glass, normal power is adopted on a normal low-temperature situation, power for an extremely-cold situation is switched to on an extremely cold situation, quick deicing and defrosting are achieved, the defect that single heating power cannot cope with environment temperature changes is avoided, and meanwhile, the situation that when temperature is high, the glass is damaged due to a single large-power heating mode can be avoided.

Description

technical field [0001] The invention relates to a front window glass of a vehicle, in particular to an electric heating device for the front window glass applied to rail vehicles such as high-speed EMUs and a method for deicing by using the electric heating device, and belongs to the technical field of rail vehicle manufacturing. Background technique [0002] When rail vehicles such as high-speed EMUs operate in winter or in extremely cold regions, a layer of fog, or frost, or even a layer of ice will be formed on the surface of the front window glass, which seriously affects the sight of the driver and passengers. It is impossible to wipe the glass during driving, which will cause inconvenience in driving, and may cause traffic accidents in severe cases. [0003] The usual method is to arrange a layer of metal heating wire on the front window glass, and then connect to 12V or 24V voltage, and use the heat generated by the heating wire to heat the front window glass to defro...

AI Technical Summary

Problems solved by technology

[0002] When rail vehicles such as high-speed EMUs operate in winter or in extremely cold regions, a layer of fog, or frost, or even a layer of ice will be formed on the surface of the front window glass, which seriously affects the sight of the driver and passengers. It is impossible to wipe the glass during driving, which will cause inconvenience to driving, and may cause traffic accidents in severe cases

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